How much more do I need for the next level. Why isn't is posted any where.
What do I need to do to reach an upgrade in fluency?
How can I return to the lesson after I enter into a discussion. For some obscure reason this is no longer possible.
Level 25 is the highest possible level in Duolingo.
The fluency score is very inaccurate. It can only reach 50-60% fluency anyway, so I would suggest ignoring it.
I think the website has been rewritten so that the discussions for sentences open in a new tab. You can view the discussion, then exit out the tab and return to your lesson.